"Here is a totally simple-minded little experiment- which turns out to be brilliant; and I'd have to predict a classic demonstration for all students of physics, mathematics, and music, for eons to come: This one was built at Harvard; and in the very best scientific tradition, they do not take the credit for it:
'Our apparatus was built from a design published by Richard Berg {Am J Phys 59(2), 186-187 (1991)} at the University of Maryland. He claims their version is copied from one at Moscow State University and they claim to have seen it first in the US, so we don't know who made one first. The apparatus we have was designed and built by Nils Sorensen.' "
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